 Organic acids
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Lipids
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Carbohydrates
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Nucleic acids
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Peptides
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Vitamins and cofactors
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 Steroids
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18-Carbon atoms
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19-Carbon atoms
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21-Carbon atoms
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23-Carbon atoms
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24-Carbon atoms
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27-Carbon atoms
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Cholestane derivatives [Fig]
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 C15337 Allocholesterol
C00187 Cholesterol
C01164 7-Dehydrocholesterol
C01802 Desmosterol
C00477 Ecdysone
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Spirostan derivatives [Fig]
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Furostan derivatives [Fig]
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28-Carbon atoms
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29-Carbon atoms
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30-Carbon atoms
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Hormones and transmitters
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Antibiotics
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Compounds with Biological Roles